Attempt all TDD Tasks!

Author: maryam-devio

Sprint-3/2-practice-tdd/count.js

@@ -1,5 +1,12 @@
 function countChar(stringOfCharacters, findCharacter) {
-  return 5
+  const lengthOfStr =  stringOfCharacters.length;
+  let  numOfOccurrence = 0;
+  for(let i = 0; i< lengthOfStr ; i++){
+    if(stringOfCharacters[i] == findCharacter){
+      numOfOccurrence = numOfOccurrence +  1;
+    }
+  }
+  return numOfOccurrence;
 }
 
 module.exports = countChar;

Sprint-3/2-practice-tdd/count.test.js

@@ -22,3 +22,9 @@ test("should count multiple occurrences of a character", () => {
 // And a character `char` that does not exist within `str`.
 // When the function is called with these inputs,
 // Then it should return 0, indicating that no occurrences of `char` were found.
+test("should return 0 when the character does not exist in the string", () => {
+  const str = "Hello world";
+  const char = "a";
+  const count = countChar(str, char);
+  expect(count).toEqual(0);
+});

Sprint-3/2-practice-tdd/get-ordinal-number.js

@@ -1,5 +1,21 @@
 function getOrdinalNumber(num) {
-  return "1st";
+  let getStr = num.toString();
+  let lastTwoDigit = getStr.slice(-2);
+  let lastDigit = getStr.slice(-1);
+  if(lastTwoDigit == "11" || lastTwoDigit == "12" || lastTwoDigit == "13"){
+    return getStr + "th"; 
+  }
+  else if(lastDigit =="1"){
+    return getStr + "st";
+  }
+  else if(lastDigit == "2"){
+    return getStr + "nd";
+  }
+  else if(lastDigit == "3"){
+    return getStr + "rd";
+  }
+  else{
+    return getStr + "th";
+  }
 }
-
 module.exports = getOrdinalNumber;

Sprint-3/2-practice-tdd/get-ordinal-number.test.js

@@ -18,3 +18,21 @@ test("should append 'st' for numbers ending with 1, except those ending with 11"
   expect(getOrdinalNumber(21)).toEqual("21st");
   expect(getOrdinalNumber(131)).toEqual("131st");
 });
+
+test("should append 'nd' for numbers ending with 2, except those ending with 12", () => {
+  expect(getOrdinalNumber(2)).toEqual("2nd");
+  expect(getOrdinalNumber(22)).toEqual("22nd");
+  expect(getOrdinalNumber(42)).toEqual("42nd");
+  expect(getOrdinalNumber(102)).toEqual("102nd");
+});
+test("should append 'rd' for numbers ending with 3, except those ending with 13", () => {
+  expect(getOrdinalNumber(3)).toEqual("3rd");
+  expect(getOrdinalNumber(23)).toEqual("23rd");
+  expect(getOrdinalNumber(103)).toEqual("103rd");
+});
+test("should append 'th' for numbers", () => {
+  expect(getOrdinalNumber(4)).toEqual("4th");
+  expect(getOrdinalNumber(10)).toEqual("10th");
+  expect(getOrdinalNumber(13)).toEqual("13th");
+  expect(getOrdinalNumber(100)).toEqual("100th");
+});

Sprint-3/2-practice-tdd/repeat-str.js

@@ -1,7 +1,17 @@
-function repeatStr() {
+function repeatStr(str, count) {
   // Your implementation of this function must *not* call String.prototype.repeat (https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/repeat).
   // The goal is to re-implement that function, not to use it.
-  return "hellohellohello";
+  let result="";
+  if (count >=1){
+    for(let i=1 ; i <= count ; i++){
+    result= str + result;
+  }
+  return result;
+  }
+  else if (count == 0){
+    return "";
+  }
+  throw new Error("invalid count")
 }
 
 module.exports = repeatStr;

Sprint-3/2-practice-tdd/repeat-str.test.js

@@ -1,32 +1,34 @@
 // Implement a function repeatStr
 const repeatStr = require("./repeat-str");
-// Given a target string `str` and a positive integer `count`,
-// When the repeatStr function is called with these inputs,
-// Then it should:
-
-// Case: handle multiple repetitions:
-// Given a target string `str` and a positive integer `count` greater than 1,
-// When the repeatStr function is called with these inputs,
-// Then it should return a string that contains the original `str` repeated `count` times.
 
+// Case: handle multiple repetitions
 test("should repeat the string count times", () => {
   const str = "hello";
   const count = 3;
   const repeatedStr = repeatStr(str, count);
   expect(repeatedStr).toEqual("hellohellohello");
 });
 
-// Case: handle count of 1:
-// Given a target string `str` and a `count` equal to 1,
-// When the repeatStr function is called with these inputs,
-// Then it should return the original `str` without repetition.
+// Case: handle count of 1
+test("should return the original string when count is 1", () => {
+  const str = "Maryam";
+  const count = 1;
+  const repeatedStr = repeatStr(str, count);
+  expect(repeatedStr).toEqual(str);
+});
+
+// Case: handle count of 0
+test("should return an empty string when count is 0", () => {
+  const str = "Hello World!";
+  const count = 0;
+  const repeatedStr = repeatStr(str, count);
+  expect(repeatedStr).toEqual("");
+});
 
-// Case: Handle count of 0:
-// Given a target string `str` and a `count` equal to 0,
-// When the repeatStr function is called with these inputs,
-// Then it should return an empty string.
+// Case: handle negative count
+test("should throw an error when count is negative", () => {
+  const str = "Hello World!";
+  const count = -1;
 
-// Case: Handle negative count:
-// Given a target string `str` and a negative integer `count`,
-// When the repeatStr function is called with these inputs,
-// Then it should throw an error, as negative counts are not valid.
+  expect(() => repeatStr(str, count)).toThrow();
+});